package Industridraperier_Admin.namespace;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DB_Klass extends SQLiteOpenHelper {

	//The Android's default system path of your application database.
    private static String DB_PATH = "/data/data/Industridraperier_Admin.namespace/databases/";
 
    private static String DB_NAME = "Databas";
 
    private SQLiteDatabase myDataBase; 
 
    private final Context myContext;
    
    private static int DATABASE_VERSION = 1;
 
    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param context
     */
    public DB_Klass(Context context) {
 
    	super(context, DB_NAME, null, DATABASE_VERSION);
        this.myContext = context;
    }
 
  /**
     * Creates a empty database on the system and rewrites it with your own database.
     * */
    
    public void createDataBase() throws IOException{
 /*
    	boolean dbExist = checkDataBase();
 
    	if(dbExist){
    		this.getWritableDatabase();
    		//do nothing - database already exist
    	}else{
 
    		//By calling this method and empty database will be created into the default system path
               //of your application so we are gonna be able to overwrite that database with our database.
        	this.getReadableDatabase();
 
        	try {
 
    			copyDataBase();
 
    		} catch (IOException e) {
 
        		throw new Error("Error copying database");
 
        	}
    	}
 */		boolean dbExist = checkDataBase();
 			if (dbExist) {
 				Log.v("DB Exists", "db exists");
 				
 					// By calling this method here onUpgrade will be called on a
 					// writeable database, but only if the version number has been
 					// bumped
 				this.getWritableDatabase();
 			}
 				dbExist = checkDataBase();
 				if (!dbExist) {
 					// By calling this method and empty database will be created into
 					// the default system path of your application so we are gonna be
 					// able to overwrite that database with our database.
 					this.getReadableDatabase();
 					try {
 						copyDataBase();
 					} catch (IOException e) {
 						throw new Error("Error copying database");
 					}
 				}
	 }
    
 
    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase(){
 
    	SQLiteDatabase checkDB = null;
 
    	try{
    		String myPath = DB_PATH + DB_NAME;
    		checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
 
    	}catch(SQLiteException e){
 
    		//database does't exist yet.
 
    	}
 
    	if(checkDB != null){
 
    		checkDB.close();
 
    	}
 
    	return checkDB != null ? true : false;
    }
 
    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     * */
    private void copyDataBase() throws IOException{
 
    	//Open your local db as the input stream
    	InputStream myInput = myContext.getAssets().open(DB_NAME);
 
    	// Path to the just created empty db
    	String outFileName = DB_PATH + DB_NAME;
 
    	//Open the empty db as the output stream
    	OutputStream myOutput = new FileOutputStream(outFileName);
 
    	//transfer bytes from the inputfile to the outputfile
    	byte[] buffer = new byte[1024];
    	int length;
    	while ((length = myInput.read(buffer))>0){
    		myOutput.write(buffer, 0, length);
    	}
 
    	//Close the streams
    	myOutput.flush();
    	myOutput.close();
    	myInput.close();
 
    }
 
    public void openDataBase() throws SQLException{
 
    	//Open the database
        String myPath = DB_PATH + DB_NAME;
    	myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
    	
    	 onUpgrade(myDataBase, DATABASE_VERSION, 2);
 
    }
 
    @Override
	public synchronized void close() {
 
    	    if(myDataBase != null)
    		    myDataBase.close();
 
    	    super.close();
 
	}
    
    public Cursor getAllProducts()
    {
    	getReadableDatabase();
        return  myDataBase.rawQuery("SELECT Benamning FROM Produkter", new String[] {});
     //   return  myDataBase.rawQuery("SELECT Benamning, Annan_Benamning, Pris, Enhet FROM Produkter", new String[] {});
    }
 
	@Override
	public void onCreate(SQLiteDatabase db) {
		
	}
 
	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		 // TODO Auto-generated method stub
		if (newVersion > oldVersion)
			Log.v("Database Upgrade", "Database version higher than old.");
			myContext.deleteDatabase(DB_NAME);
	}

	public Cursor rawQuery(String string, String[] strings) {
		// TODO Auto-generated method stub
        return  myDataBase.rawQuery(string, strings);

	}
	}
 

